Add latest develop code to PyPi

[ChrisCalderon]

When I install ethereum-serpent using pip, I still get an older version of the module which doesn't include several fixes, like the str_types change, the fix for json.loads requiring a string, and the forgotten print statement. It looks like the code on the develop branch has fixed all these issues. Could you please update the PyPi package?

[beaugunderson]

+1, this would be great for augur-core to use as well.